Traffic could be backed up in downtown Springfield as both sides of I-91 will be closed overnight Wednesday and Thursday.

From 7 p.m. to 5:30 a.m. drivers on 91 north will be directed off the highway at exit 3 and onto East Columbus Avenue and will get back on the highway at the on-ramp north of Union Street.

Drivers on 91 south will be taken off the highway from 8 p.m. to 5:30 a.m. at exit 6. Traffic will be detoured to West Columbus/Hall of Fame Avenue and will be back on the highway at the interchange 3 on-ramp.

The overnight closures are in place so crews can continue milling, paving, and bridge work.